Under military rule from 1965 to 1979, Brazil had a legally enforced two party system, with supporters of the regime gathered under the National Renewal Alliance Party (ARENA) umbrella, and the official opposition making up the MDB.
Up to 1965, there were three main parties in Brazil: the left-wing populist Brazilian Labour Party (PTB), the liberal Social Democratic Party (PSD) and the conservative National Democratic Union (UDN).
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